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  • Also, blanks in your columns could mess it up as the counta in the named range formula may not pick them up.

    I think I started you down this track with an idea that large named ranges could slow down the countifs. Apologies if it's a faff. I don't know the size of your data, but it might be worth trying to see if changing the named ranges from F:F to F1:F10000 (or something) actually does speed up your sheet.

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